The state departments of Health and Conservation and Natural Resources announced the decision Tuesday, two weeks after they began looking into at least 15 cases in which people who swam there in July became sick.

Park visitors are still being warned not to drink untreated lake water, and to cook fish before eating it.

Officials say there's no reason to think the park's drinking water is to blame for the illnesses, but they did find E. coli in raw, untreated water inside one of the park's two wells.

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